Adolph baeybe



UNITE STATES PATENT OFFICE,

ADOLPH BAEYER, OF MUN IGH, BAVARIA, ASSIGNOR TO BADISCHE ANILIN AND SODA FABRIK, OF MANNHEIM, GERMANY.

MANUFACTURE OF ARTIFECIAL lNDlGO.

SPECIFICATION forming part-of Letters Patent No. 251,499, dated December 27, 188},

Application filed September 29, 1881. (Specimens) To all whom it may concern Be it known that I, ADoLrn BAEYER,asubject of the King of Bavaria, residing at Munich, in the Kingdom 05 Bavaria and Empire of Germany, have invented new and useful-Improvements in the Ireparationof a Sew Ma terial for the Manufacture of Artificial Indigo, of which the following is a. specification.

This invention relates to the preparation of orthonitroacetenyl benzine-a material intended to be used in the manufacture of an artificia-l indigo-blue.

As an example of the manner in which my invention may be carried into efi'ect, I proceed as follows: I mix one part, by'weight,of orthonitrophenylpropiolic acid with about one hundred parts of water. I then submit the said mixture to a distillation with steam, whereby the said orthonitrophenylpropiolic acid gets decomposed into carbonic acid and into ortho' i'litroacetenyl benzine; The latter compound distills over with the aqueous vapors, and G011- deuses upon cooling in a solid crystalline condition. I thenseparate the orthonitroacetenyl benzine thus produced from the condensed water by filtering and drying.

Some of the characteristic properties of orthonilroacetenyl benziue produced as above described are as follows: It is soluble in alcohol, etheiy-benzine, and sparingly soluble in 3') water. v Boiled with a solution of bisulphite of ammonium it gradually dissolves with the production of a new snlpho-acid, which will be made the subject-matter of-a later application for Letters Patent. The said sulpho-acid is 3 5 capable of being converted into an artificalindigo-blueupon being boiled with concentrated mnriatic acid, or upon being treated in the cold with alkaline reducing agents, such as zincdust and ammonia. ()rthenitroacetenyl ben- 40 zine mixed in alcoholic solution with an ammoniacal solution of cuprons chloride is changed into a characteristic copper compound possessin g a bright-red color.

What I claim as new, and desire to secure 45 by Letters Patent, is-

As a new article of manufacture, the orthonitroacetenyl benzine hereinbefore described, and having the characteristics above stated.

In testimony whereof I have hereunto set 50 my hand in the presence of two subscribing witnesses. ADOLPH BAEYER.

Witnesses:

PAUL FRIEDLAENDER, LUDVIG LUNDSBERG. 

